Unknown power consumption from Bluetooth LE advertising

[JonasGel]

nRF connect SDK 2.1.2 - nRF52805

Hello, I have an unknown power consumption from bluetooth advertising. I have set an advertising interval of 2 seconds and start the advertising with the function: bt_le_adv_start(ADVERTISING_INTERVAL_2, freshAdvertisingPacket, ARRAY_SIZE(freshAdvertisingPacket), sd, ARRAY_SIZE(sd));

In the Power Profiler I spotted the Advertisement power consumption every 2 seconds, but also every 8 seconds another consumption that I want to eliminate.
The power consumption unknown to me is about 17ms and has an average consumption of about 450uA.

I would imagine it's scanning, but I don't know how to turn that off yet.

Overview (unknown + advertising )

Detailed view of unknown power consumption:

Can someone help me to map and disable this process?

[helsing]

Hello Jonas,

This is likely the LFRC calibration which occurs every eight seconds when using the internal oscillator of the SoC.

Here is a DevZone post discussing LFRC vs LFXO .

If using the DK, try enabling LFXO to see if it goes away.

Would you be able to share the recording from PPK II? We could look closer into the current profile.